Fig. 2

Spatial distribution of coseismic changes in the groundwater head due to 2011 Iwaki earthquake based on field survey. Red circles, red triangles and blue triangles indicate hot springs where discharge, water level increase, and water level decrease were observed during earthquake, respectively, and numbers correspond to those in Table 1. Calculated results of the changes in the crustal volumetric strain during earthquake using fault models proposed in Kobayashi et al. (2012) are also shown